Kernel: Add Timer::ns_since_boot()

kernel/include/kernel/Timer/HPET.h

@@ -12,6 +12,7 @@ namespace Kernel
 		static BAN::ErrorOr<BAN::UniqPtr<HPET>> create(bool force_pic);
 
 		virtual uint64_t ms_since_boot() const override;
+		virtual uint64_t ns_since_boot() const override;
 		virtual timespec time_since_boot() const override;
 
 		virtual void handle_irq() override;

kernel/include/kernel/Timer/PIT.h

@@ -12,6 +12,7 @@ namespace Kernel
 		static BAN::ErrorOr<BAN::UniqPtr<PIT>> create();
 
 		virtual uint64_t ms_since_boot() const override;
+		virtual uint64_t ns_since_boot() const override;
 		virtual timespec time_since_boot() const override;
 
 		virtual void handle_irq() override;

kernel/include/kernel/Timer/Timer.h

@@ -14,6 +14,7 @@ namespace Kernel
 	public:
 		virtual ~Timer() {};
 		virtual uint64_t ms_since_boot() const = 0;
+		virtual uint64_t ns_since_boot() const = 0;
 		virtual timespec time_since_boot() const = 0;
 	};
 
@@ -25,6 +26,7 @@ namespace Kernel
 		static bool is_initialized();
 
 		virtual uint64_t ms_since_boot() const override;
+		virtual uint64_t ns_since_boot() const override;
 		virtual timespec time_since_boot() const override;
 		
 		void sleep(uint64_t ms) const;

kernel/kernel/Timer/HPET.cpp

@@ -148,6 +148,12 @@ namespace Kernel
 		return read_register(HPET_REG_COUNTER) * m_counter_tick_period_fs / FS_PER_MS;
 	}
 
+	uint64_t HPET::ns_since_boot() const
+	{
+		// FIXME: 32 bit CPUs should use 32 bit counter with 32 bit reads
+		return read_register(HPET_REG_COUNTER) * m_counter_tick_period_fs / FS_PER_NS;
+	}
+
 	timespec HPET::time_since_boot() const
 	{
 		uint64_t time_fs = read_register(HPET_REG_COUNTER) * m_counter_tick_period_fs;

kernel/kernel/Timer/PIT.cpp

@@ -62,6 +62,11 @@ namespace Kernel
 		return m_system_time * (MS_PER_S / TICKS_PER_SECOND);
 	}
 
+	uint64_t PIT::ns_since_boot() const
+	{
+		return m_system_time * (NS_PER_S / TICKS_PER_SECOND);
+	}
+
 	timespec PIT::time_since_boot() const
 	{
 		uint64_t ticks = m_system_time;

kernel/kernel/Timer/Timer.cpp

@@ -59,6 +59,11 @@ namespace Kernel
 		return m_timer->ms_since_boot();
 	}
 
+	uint64_t SystemTimer::ns_since_boot() const
+	{
+		return m_timer->ns_since_boot();
+	}
+
 	timespec SystemTimer::time_since_boot() const
 	{
 		return m_timer->time_since_boot();